Snap-Fit Fastening Device for Electronic Assembly
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Solution Overview
Problem
Conventional methods for fixing two elements in electronic assemblies, such as hard disk assemblies, require numerous screws and tools, leading to increased assembly time, higher defective rates, and inefficiencies in part usage.
Innovation Solution
A fastening device comprising a sliding unit with guiding rails and positioning pins, and a carrier unit with limiting units and a link-handle, which allows for snap fixation of electronic devices using a simple plug design, reducing the need for tools and preventing movement in any direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws are used to fix two elements tightly, then the fixation strength is improved, but the assembly time increases and tools are required
Solution Approach 1:
The fastening device is divided into separate functional components: a sliding unit with positioning pins for precise alignment, and a carrier unit with limiting units for directional constraint. This segmentation allows each component to perform its specific function efficiently, enabling quick snap-fit assembly without requiring multiple screw operations
Solution Approach 2:
The patent replaces the traditional screw-thread mechanical fastening system with a snap-fit mechanism using positioning pins and limiting units. This substitution eliminates the need for rotational fastening actions and tool usage, reducing assembly time while maintaining fixation strength through precise geometric interlocking
2Reliability
If multiple screws are used for fixation, then the reliability of fixation is improved, but the device complexity increases
Solution Approach 1:
Multiple fixation functions (positioning, alignment, and constraint in multiple directions) are merged into a single integrated fastening device structure. The sliding unit and carrier unit work together as one system to provide reliable fixation without requiring multiple separate screws and washers, thereby reducing part quantity while maintaining reliability
Solution Approach 2:
The fastening device is designed with multi-functionality: the positioning pins provide both alignment and positioning functions, while the limiting units simultaneously constrain movement in multiple directions. This universal design allows a single device to perform multiple fixation tasks that would traditionally require several different fasteners
3Ease of manufacture
If traditional fixation methods are used, then the assembly process is simple, but the defective rate increases due to assembly errors
Solution Approach 1:
The positioning pins are pre-configured in specific positions and orientations on the sliding unit before assembly. This preliminary positioning action guides the components into correct alignment during assembly, preventing misalignment errors and reducing defective rates while maintaining assembly simplicity
Solution Approach 2:
The fastening device incorporates self-aligning and self-limiting features through its geometric design. The positioning pins automatically align with corresponding holes, and the limiting units self-constrain movement in prohibited directions. This self-service mechanism reduces reliance on operator skill and minimizes assembly errors without complicating the manufacturing process
Data Source
AI summary
A fastening device is used to snap and carry an electronic device which includes a plurality of positioning holes on its bottom side. The fastening device has a sliding unit and a carrier unit. The sliding unit is used to connect with and carry the electronic device and includes two guiding rails, a pushing portion, and a plurality of positioning pins. The carrier unit is connected with the sliding unit and comprises a plate, a plurality of first limiting units, a plurality of second limiting units, and a link-handle. Through the fastening device, the assembly process for the electronic device is simplified.